Umkhuhlane wokuvavanya amasampula okuthuthukisekile kwi-drug samples kufanele kube ngenkinga yomsebenzi wakwesifundo esisethweni sipharamasekhetikali. Ukuphambuka lokhu lwe-drug samples kumoya omphathelene obungena amasampula nokuthi abheke umoya ongene amasampula. Amakhuhlane amaphutha amadringi ane-test paper akho ayiziphiwe ngamaxesha amandla nokubheka okusezisize ukuthi amasampula akho angalindele amoya omphathelene phambi kwezikhatsi nokuthi zihambiswe. Lokhu libonisa kulula kakhulu kwisezintsha apharamasekhetikali apho isikhundla esincinci sibulale amandla. Usafaka ukuthi izinhlobo zakho zizame ukuba amanqaku akho azilindele nekhono nokuhlola ezinomsindo ezikhona kusenzo esingazama kulesifundo.